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FCompetitor Products Analysis

Table of Contents

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Analysers from Some of our Main Competitors

ABB

AMETEK (Thermox)

Emerson (Rosemount)

Servomex

Yokogawa

Lamtec

The failures and problems mentioned on the following pages are failures andproblems which were reported from world market customers to ENOTEC

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ABBThe measuring cell is pasted onthe flange plate with glass solder.

The thermocouple is at the same time the contact of electrodes at the reference air side.

1.The thermocouple fuses to the cell 2. High spot loading results in thedestruction of the platinum coating

Ingress of air at the joint, whichwill not be detected

The measured value is correct

with test gas, but too highwith process gas

Design of the measuring cell with dead-end

High deposit of dust on the ceramic filter disk

Long response time

Measuring cell temperature too low (700C) Incorrect measurement because of

cross sensitivity against combustiblesin the process gas (measured value toolow)

Bad process gas exchange

Process GasLow Pressure

Reference Gas

By vibration the cell breaks offafter few months.

No explosion approval for a complete probe.

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AMETEK (Thermox)Close-Coupled extractivemeasurement:

Easily soiled in flue gas with dust

Corrosion problems, if thesampled gas is falling below thedew point

Leakage due to vibration through

pasted ZrO2 measuring cell

Inaccurate COe measurement through two PT100 means zero reading most of thetime

Measuring value is correct with test gas (positive pressure) but much to high withextracted flue gas (negative pressure) due to a leaking sampling probe

No explosion approval for a whole measuring device.

Blockages inside the sampling tubes

Leaking or blocked sampling tubes

O2 value too high

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AMETEK (Thermox)

InSitu Measurement(WDG-INSITU)

Cell temperature 615C 650C,(higher temperatures are not possiblebecause of leakages arising from theceramic glue)

Incorrect measured valuesbecause of cross sensitivityagainst combustibles(measured values too low)

Ingress of air at the joint, which willnot be detected by calibration

Measured value is correct withtest gas, but much to high withprocess gas

Small probe filter easily blocked in coal and oil fired boilers

No explosion approval for a complete probe.

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Emerson (Rosemount) OXYMITTER

Measuring cell is soldered, but has ameasuring cell design with dead-end

Bad process gas exchange (T90 time approx. 5 minwith flue gas)

Electronics at the terminal box Temperature problems and overheated electronics

By default no protection tube

Flow meter and pressure reducer forreference air and test gas have to bemounted separately.

High additional assembly effort, poor design, highmaintenance costs

No internal flow rate monitoring

Problems in case of measuring cell exchange through

increased corrosion

No automatic calibration for explosion approved probes

High wear of the probe body, abrasive flue gas willreduce the probe life time below 1 year

Flange connection of the cell is

located in the hottest area

Cell temperature too low (720C) Incorrect measured values because of cross sensitivity

against combustibles (measured values much too lowwith combustibles)

No explosion approval for a functional probe.

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Emerson (Rosemount) OCX 4400

Easily soiled

Corrosion problems if the samplinggas is falling below the dew point

Inaccurate COe measurement through two PT100 means zero reading all the time

Measuring value is correct with test gas (positive pressure) but much to highwith extracted flue gas (negative pressure) due to a leaking sampling probe

Blockages inside the sampling tube

Leaking or blocked sampling tube

Close-CoupledExtractiveMeasurement:

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Servomex

Great danger of soiling

Measuring gas tube blocks

O2 measuring cell temperature toolow

Incorrect measured values because ofcross sensitivity against combustibles(measured values much too low)

COe measurement by two PT100

Small critical nozzle

Extractive measurement Great danger of soiling

Only the control unit is ATEX explosion approved, not the probe.

High drift and bad resolution below500 ppm COe

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Yokogawa

Low measuring cell temperature (700C),since the measuring cell is pasted

Incorrect measured values because ofcross sensitivity against combustibles(measured values much too low)

Design of the measuring cell with dead-end Bad gas exchange

Flange connection of the cell is located inthe hottest area and is directly exposed tothe flue gas, since the standard probe does

not have a filter.

Problems in case of measuring cellexchange through increased corrosion andsoiling of the cell

Ingress of air at the joint, which will not bedetected by calibration since leak airexpelled during calibration.

Measured value is correct with test gas, butincorrect with process gas

No long probes, because 2 m probes and above would shake themselves to pieces and parts

No explosion approved at all

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Lamtec

Cell temperature (600C), highertemperatures are not possible becauseof arising leakages of the ceramic glue

Incorrect measured values because ofcross sensitivity against combustibles(measured values too low)

Only short probes just for clean flue gas probe approx. 30 mm long

O2 measuring cell from the motorcartechnology ( probe), measuring cell

pasted

Flue gas temperature only up to max.

300C. Cell leakage at higher flue gas

temperatures

Bypass principle which blocks easilywith dust

Measured value can be correct with testgas, but slow and inaccurate withprocess gas due to dust which settles onthe sensor

Lambda ProbeLS2

No explosion approved at all